Size:60*34*11mm. Made of high-grade iron, durable and reusable. Excellent small containers. Build quality is good and sturdy. Our rectangular is made of good quality tinplate, can be applied for a long time. The lids slide on and off fine. The round margin are smooth without seamlessly, protect your hands,good sealing. Perfect size and the tops slide with just the right amount of resistance--not too tight but not too loose either. The flat shape fits better in pockets and small wallet-type purses. They don't take up too much room in your pocket. They slide open and lock in place fine enough to open and close easily but not enough to open on their own. They are perfect for organizing all your really small items. It is suitable for the storage of various small jewelry, pillsfish hookspaper clips, medicines, buttons, small band aids,small screws or anything that is easily lost,etc. You'll always find a use for these.